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Treatment technology for wastewater from production of neopentyl glycol

A technology for neopentyl glycol and waste water production, which is applied in biological water/sewage treatment, water/sewage treatment, sustainable biological treatment, etc. It can solve the problems of non-easy biodegradation and impact, reduce pretreatment costs, guarantee The effect of blowing off and the effect of achieving standard discharge

Inactive Publication Date: 2010-07-14
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the activity of biological treatment is greatly affected by the initial concentration of formaldehyde. It is generally believed that the allowable concentration of formaldehyde in biological treatment poisons is 100-150mg / L
[0006] Neopentyl glycol production wastewater is a high-concentration organic wastewater containing a high concentration of harmful substances-formaldehyde and is not easy to biodegrade, so it cannot be directly subjected to anaerobic biological treatment and aerobic biological treatment

Method used

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  • Treatment technology for wastewater from production of neopentyl glycol
  • Treatment technology for wastewater from production of neopentyl glycol
  • Treatment technology for wastewater from production of neopentyl glycol

Examples

Experimental program
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Embodiment 1

[0016] Such as figure 1 As shown, the neopentyl glycol production wastewater process includes three steps: pretreatment, main treatment and advanced treatment:

[0017] (1) Pretreatment

[0018] Due to the high concentration of formaldehyde in the high-concentration organic wastewater produced by the neopentyl glycol production process, formaldehyde can combine with the amino group of the protein to denature the protein, destroy the cytoplasm of the bacteria, and inactivate the organism, which has a great effect on the biological treatment of wastewater. The impact is very large, so a pretreatment step to reduce the concentration of formaldehyde must be carried out before the main treatment step.

[0019] The pretreatment is to adjust the pH value of the organic wastewater to 7-8 by acid or alkali, and then carry out heating and stripping treatment. The heating blow-off treatment is to pass water vapor into the organic waste water, control the temperature of the organic wast...

Embodiment 2

[0033] Such as figure 1 As shown, the neopentyl glycol production wastewater process includes three steps: pretreatment, main treatment and advanced treatment:

[0034] (1) Pretreatment

[0035] Adjust the pH value of the organic wastewater to 7 by acid or alkali, and then carry out heating and stripping treatment. The heating blow-off treatment is to control the temperature of the organic waste water at 60° C., blow air into the organic waste water, the volume ratio of the blown air to the organic waste water is 15:1, and the time for heating and blowing air is 3 hours.

[0036] (2) Main treatment, that is, anaerobic biological treatment and aerobic biological treatment in sequence

[0037] Anaerobic biological treatment adopts two-stage UASB (upflow anaerobic sludge bed) process. The main design parameters of anaerobic biological treatment: the first-stage anaerobic design volume load is 8 ~ 10kgCOD Cr / (m 3 d), the design volume load of the secondary anaerobic is 3~4kg...

Embodiment 3

[0042] Such as figure 1 As shown, the neopentyl glycol production wastewater process includes three steps: pretreatment, main treatment and advanced treatment:

[0043] (1) Pretreatment

[0044] Adjust the pH value of organic wastewater to 8 by acid or alkali, and then carry out heating and stripping treatment. The heating blow-off treatment is to pass water vapor into the organic waste water for heating, control the temperature of the organic waste water at 70°C, and at the same time blow air into the organic waste water, the volume ratio of the blown air to the organic waste water is 20:1, Heating and blowing air for 4 hours, the generated formaldehyde gas is recovered.

[0045] (2) Main processing

[0046] Anaerobic biological treatment adopts EGSB (expanded granular sludge bed) process.

[0047] The aerobic biological treatment adopts the modified process of activated sludge method - SBR wastewater treatment process.

[0048] (3) Advanced processing

[0049] The proces...

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Abstract

The invention provides a treatment technology for wastewater from the production of neopentyl glycol, which sequentially implements anaerobic biological treatment, aerobic biological treatment, filtration by quartz sand and adsorption by activated carbon on organic wastewater generated in the production process of neopentyl glycol. Pretreatment is implemented on the organic wastewater generated in the production process of neopentyl glycol before the anaerobic biological treatment, namely the concentration of formaldehyde in the organic wastewater is reduced by adjusting the pH value of the organic wastewater to 7 to 8 with acid or alkaline and then by heating air-stripping treatment. The heating air-stripping treatment comprises the steps: controlling the temperature of the organic wastewater between 60 and 70 DEG C and bubbling air into the organic wastewater for 3 to 4 hours, wherein the volume ratio of the bubbled air to the organic wastewater is (15-20):1. Adopting the economical, reasonable and innovative combined technology with the wastewater treatment technological procedures of heating air-stripping pretreatment-anaerobic biological treatment-aerobic biological treatment-advanced treatment, the treatment technology settles the difficult problem about the wastewater resulted from the production of neopentyl glycol and realizes standard-reaching discharge of wastewater.

Description

technical field [0001] The invention belongs to water pollution prevention and resource utilization technology, in particular to a treatment process for neopentyl glycol production wastewater. Background technique [0002] Neopentyl glycol (scientific name 2,2-dimethyl-1,3-propanediol, referred to as NPG) is mainly used in the production of high-grade alkyd resin, and its consumption accounts for 75% of the total consumption; in addition, it is also used in lubricating oil, Plasticizers, polyester polyols, flame retardants, pharmaceuticals and pesticides, etc. [0003] There are two industrialized production routes of NPG, namely the halopropanol route and the isobutyraldehyde route. At present, the industrial production of NPG at home and abroad basically adopts the isobutyraldehyde route, that is, isobutyraldehyde and formaldehyde are used as starting materials, and the intermediate 2,2-dimethyl-3-hydroxypropanal (commonly known as Hydroxypivalaldehyde, referred to as HP...

Claims

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Application Information

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IPC IPC(8): C02F9/14C07C31/20C07C29/00C02F3/28C02F3/12C02F1/00C02F1/28
CPCY02W10/10
Inventor 刘义孙全庆蔚龙凤周建国刘胖友陈乡
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY